/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.common;

import java.security.SecureRandom;
import java.util.logging.Logger;


/**
 * A wrapper for the pseudo-random number generator seed.
 */
public class FreeColSeed
{

    private static final Logger logger = Logger.getLogger( FreeColSeed.class.getName( ) );

    public static final long DEFAULT_SEED = 0L;

    private static long freeColSeed = DEFAULT_SEED;


    /**
     * Gets the seed for the PRNG.
     *
     * @param generate Force generation of a new seed.
     * @return The seed.
     */
    public static long getFreeColSeed( boolean generate )
    {
        if ( generate )
        {
            freeColSeed = new SecureRandom( ).nextLong( );
            logger.info( "Using seed: " + freeColSeed );
        }
        return freeColSeed;
    }

    /**
     * Sets the seed for the PRNG.
     *
     * @param arg A string defining the seed.
     */
    public static void setFreeColSeed( String arg )
    {
        try
        {
            FreeColSeed.freeColSeed = Long.parseLong( arg );
        }
        catch ( NumberFormatException nfe ) {}
    }

    /**
     * Increments the seed for the PRNG.
     */
    public static void incrementFreeColSeed( )
    {
        freeColSeed = getFreeColSeed( false ) + 1;
        logger.info( "Reseeded with: " + freeColSeed );
    }
}
